X-ray tube and installation for operating the said tube



6v 1927. Sept A, BoUwERs X-RAY TUBE AND INSTALLATION FOR OPERATING THE' SAID TUBE Filed Augf 25, 1925 Patented Sepa 6', 'u

" *UNITEDSTATES PATENT'I'OFFICE- -f maar aouwn'na, or nnm'novnn, v`iurrii'iiuu.amic,asaltaron ro u. v. rninirarv cmiimnmmum, or iiniriigxcvlun` unmintmns -x-na'z 'run 'um ms'ramrioii .rea orm'rnre 'm um wenn.

Application led August 19115, llo. 58,85', and in the Interlude-laren 25,- 1925.-

This invention-relates to Xray to an installation for operating same.. such installations a high tension transformer is frequently employed, the prim'ary wind-- 6 ing of which is connected to a source of low tension. As a rule these-,transformers occupy much spiace and are rather. expensive.

t is known t at for operatin X-ray tubes igh frequency currents may utihzed, in

10 which case 'a transformer without iron can be used. y

thas now been found that itis possible to combine a transformer at least partly with the X-iay tube to form a unitary de- 16 vice without the X-ray tube thereby becoin` ing more difficult to manipulate.

According to this invention, around an X-ray tube is 'wound a coil the ends of which may be electricall connected to the 2@ cathode and the anticat od Y .rent to be generated therein. In addition the lli-ray vtube may be rovided with a second coil which surroun the othei` coil and serves to generate the high tension.- llli S5 is arranged clon the axis of the Xray tube inside the secon a coil wound on the wall roi-the X-ray tube. or this if necessary, a cavity may be provided in the anticnthode along the axis of the X-ray tube, or

c@ the iron core may be arran ed in the interiory ofi the anticathode tube. t has been found that Xus/ay' tubes constructed in this manner can be perated with currents having a `iirecluency o, ier example, 500 periods. y y

instead ci using a source of current of high frequency it is also 'ble to periodically interrupt the priP-y current supplied by a source of continuous current or alternating current of lower frequency,-

@ with the aid of an interruptor. If the interruption takes place very rapidly,` the same eect is produced as in the case of high ireriliency currents.

e invention will be more clearly undersaid coil be' ing adapted to permit a hig tension cur-I stood lVwitli lreference to 'the' accompanying drawing.

An incandescent cathode 2 in the form of a stretched wire is arranged within a metal vessel 1 which-'maybe made of chrome iron forming art of the envelope of thetube and to the w l of which is secured a metal. cover 3 havin an aperture in front of which is arrang ananticathode 4, part of whose surface is opposite this aperture.` In the metal y'essel opposite the said anticathode isav window for the tissagel of the X-rays generated. Thiswin ow consists of a glass hood 5 which is hermetically sealed to the metal wall. An annular metal plate 6, for example of iron serves to screen the X-rays and has secure to it the leading-in wires for the incandescent cathode. One leadingin wire 7 for the lincandescent; cathode is led through the metal ring 6 from which it is insulated, andis sealed into the glass hood `5. The .other leading-in wire is constituted b the conductive connection of a pole 8 wi the metal ring 6 and by the metal envelope 1. The cathode rays emitted by the incandescent cathode can. strike the anticathode only on a limited surface owing to the particular shape of the wall and of the cover 3 of the metal ment of the antcatlio relatively to the said cover. To the metal vessel l. is sealed a reentrant glass tube 9 to the end of which is sealed the anticathode 4f.- Around the up per end of the anticathode is arranged a Acooling device 10. j

Around the glass art ofthe wall of the X-ray tube is woun a coil 11 which at one of its ends is connected to the metal vessel land thus is electricall 'connected to the incandescent cathode an which 'at its other end is in conductive connection with the anticathode. Around this coil 11 is provided asecoiid coil 12 which is separated from the former b insulating materi `The ends o the coil 12 can be connected` to a source of high frequency tension vconsisting, for exam le, of an oscillatory circuit in which big frequency oscillationsare generated by means of a transmission tule as used1 fog, rladiotelera hic ur s. t is evi en owever, tghai? the higlliiogequency oscillations may be lgenerated in any other known manner as a spark gap or bymeans of an arc.

vessel, and to the arrange-` means of a la er 13 of ioo for example, the coil 11 consists of a single layer of 500" turns and if the coil 12 contams 10 turns, the tension of the-tube gener-- len h of 10,000 metres.

lsecon ary oscillator tuned to eachother.

- t must be borne in mind that a oodtfunctionin is only assured if the'primary and circuits are almost or this p ose it will be necessary therefore to choose t e natural oscillations of'these circuits such that they are almost e ual to each other.

Although t e invention has been described with reference to a tubel of cylindrical shape it is evident that it can also be applied to X-ray tubes of any other shape. l What I claim is:A

1. An'X-ray tube characterized in that around the tube is wound a coil the ends of which are electrically connected to the cathode and to the anticathode, said coil being adapted to permit a high tension current to be enerated therein.

2. An -ra tube according to claim 1, characterized 'y a second coil which surrounds the' other coil and serves to generate the high tension. v

3. An X-raytube, characterized in that around the tube is wound a coi1,the ends of whichv are electrically connected to the -cathode and to the'anticathode, said coil being adapted to erm'it a high tension current to be generate therein, an iron core being larrangedinside said coil about the axis of the X-ray tube. u

4:. 'An X-ra characterized y a second co' surrounding the other coil and serving to generate the high tension. l

5.An X-ra tube, characterized in that around the tu is wound `a coil the ends of which are electrically connected to the cathode and to the anticathode, said coil being adapted to permit a high tension current to be generated therein, an iron core being arranged inside said coil in the interior of the anticathode tube.

6.An X-ra tube accordin to claim 5, characterized by a second co1 which surrounds the other coil and serves to generate the high tension.

7 An X-ray tube installation comprisin an X-ray tube, a coil being wound aroun said tube, the ends of said coil being electrically connected to the cathode 'and to the anticathode, said coil being adapted to per 'Iht a high tension current to be generated tube accordin to claim 3,

therein, a second coil surrounding the other coil and being fed varying tension. .r

8. An X-ray installation according to claim 7, an iron core being arranged inside the first coil about the axis of the X-ray by a source ofv rapidly 9. Any X-ray tube installation according to claim 7, an iron core bein arr ed inside the iirst'coil in the interior of the anti- Eindhoven, this August 1925. I

ALBERT 'BoUwERs vzo 

